5th century BC
and the space
One of the smallest parts that any substance can be
divided into,that combines with other atoms that make
A simple chemical
substance compose of
Something that consist
of a combination of
two or more atoms
E.g. Water (H₂O) a
hydrogen and oxygen
The smallest unit into which any substance
can be divided without losing its own
*even if a gold is broken into two, they are still golds.
Attractive force between
same kind of molecules.
The ability where one
kind of molecule attracts
and clings to a different
kind of molecule.
used to describe a gas that is in a
e.g. Evaporated water from the sea
Occur at extremely high
temperature and are made up of
charged part of atoms.
*rare phase of matter
At higher temperature, the molecules of a
substance move faster with increased agitation
and then they move a little faster apart thus
expanding the substance. As the substance cools
down, the motion slows and the molecular forces
are able to pull the molecules closer together.
Temperature of a gas is proportional to the
average kinetic energy of the gas molecule.(e.g.
ammonia molecules have greater average velocity
at a higher temperature and a slower average
velocity at lower temperature)
Kinetic energy involves the mass of the molecules
as their velocity:
( KE = ½ mv² )- ( d= gt²/2 )
Bachelor of Science in Home Technology Education